NDLI: 14-MeV neutron directional fiber detector modeling using GEANT

Content Provider	IEEE Xplore Digital Library
Author	Mengesha, W. Mascarenhas, N. Peel, J. Sunnarborg, D.
Copyright Year	2005
Description	Author affiliation: Sandia Nat. Labs., Livermore, CA (Mengesha, W.; Mascarenhas, N.)
Abstract	GEANT4 Monte Carlo simulation tool was used to model a prototype 14 MeV neutron fiber detector under development at the Sandia National Laboratories (SNL). Detail geometric design features of the prototype fiber detector were implemented in the modeling to assess directionality and performance of the detector. BCF-12, plastic fiber material, produced by Saint-Gobain, was used in the prototype development. The fiber consists of a core scintillating material of polystyrene with 0.48 mm times 0.48 mm dimension and an acrylic outer cladding of 0.02 mm thickness. A total of 64 square fibers, each with a cross-sectional area of 0.25 $mm^{2}$ and length of 100 mm positioned parallel with a fiber pitch of 2.3 mm, were used in the tracking of 14-MeV neutron induced recoil proton (n-p) events. Neutron induced recoil proton events, resulting energy deposition in two collinear fibers, were considered in reconstructing a two dimensional (2D) direction of incident neutrons. Energy resolution of the fiber detector was also considered to account uncertainty in direction reconstruction. Reconstructed direction has a limiting angular resolution of 3deg due to fiber dimension. Energy resolution of the fiber, which was estimated to be 10% at 14 MeV proton energy, resulted in further broadening of the reconstructed direction and the simulated angular resolution was 20deg. These values were determined when incident neutron beam makes an angle of 45 degrees relative to the front surface of the detector. Comparable values were obtained at other angles of incidence. Results from the present simulation have demonstrated promising directionality of the scintillating fiber detector under development
Starting Page	535
Ending Page	539
File Size	1525887
Page Count	5
File Format	PDF
ISBN	0780392213
ISSN	10957863
DOI	10.1109/NSSMIC.2005.1596309
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-10-23
Publisher Place	Puerto Rico
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Neutrons Detectors Energy resolution Protons Prototypes Virtual prototyping Laboratories Solid modeling Plastics Uncertainty
Content Type	Text
Resource Type	Article

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